Abstract
A series of bipyridine-centered diblock copolymers, bpy(A)(B), containing PMMA, PS, PCL, PLA, and PEG chains were synthesized via sequential, orthogonal strategies from unsymmetrical, difunctional bipyridine ligands. Specifically, the combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) generally produced bpy(PCL)(PMMA) (16) and bpy(PS)(PCL) (14) samples with anticipated molecular weights and low polydispersities (PDIs = 1.1−1.2). ROP or ATRP was also used in conjunction with a polymer coupling strategy to synthesize bpy(PEG)(R) diblocks with a bipyridine binding site at the block junction where R = PCL (12), PLA (13), or PMMA (21). Polymers with low PDIs were again generated in all cases (PDI ∼ 1.2−1.3). The particular design explored in this study could ultimately lead to block copolymeric metal complexes that form ordered assemblies with metal ions at microdomain interfaces.
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